static int make_dinode(struct gfs2_inode *dip, struct gfs2_inode *ip, const char *symname, struct buffer_head **bhp) { struct inode *inode = &ip->i_inode; struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); int error; error = gfs2_rindex_update(sdp); if (error) return error; error = gfs2_quota_lock(dip, inode->i_uid, inode->i_gid); if (error) return error; error = gfs2_quota_check(dip, inode->i_uid, inode->i_gid); if (error) goto out_quota; error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); if (error) goto out_quota; init_dinode(dip, ip, symname, bhp); gfs2_quota_change(dip, +1, inode->i_uid, inode->i_gid); gfs2_trans_end(sdp); out_quota: gfs2_quota_unlock(dip); return error; }
static int setattr_chown(struct inode *inode, struct iattr *attr) { struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_sbd *sdp = GFS2_SB(inode); struct buffer_head *dibh; u32 ouid, ogid, nuid, ngid; int error; ouid = inode->i_uid; ogid = inode->i_gid; nuid = attr->ia_uid; ngid = attr->ia_gid; if (!(attr->ia_valid & ATTR_UID) || ouid == nuid) ouid = nuid = NO_QUOTA_CHANGE; if (!(attr->ia_valid & ATTR_GID) || ogid == ngid) ogid = ngid = NO_QUOTA_CHANGE; if (!gfs2_alloc_get(ip)) return -ENOMEM; error = gfs2_quota_lock(ip, nuid, ngid); if (error) goto out_alloc; if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { error = gfs2_quota_check(ip, nuid, ngid); if (error) goto out_gunlock_q; } error = gfs2_trans_begin(sdp, RES_DINODE + 2 * RES_QUOTA, 0); if (error) goto out_gunlock_q; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out_end_trans; error = inode_setattr(inode, attr); gfs2_assert_warn(sdp, !error); gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); if (ouid != NO_QUOTA_CHANGE || ogid != NO_QUOTA_CHANGE) { u64 blocks = gfs2_get_inode_blocks(&ip->i_inode); gfs2_quota_change(ip, -blocks, ouid, ogid); gfs2_quota_change(ip, blocks, nuid, ngid); } out_end_trans: gfs2_trans_end(sdp); out_gunlock_q: gfs2_quota_unlock(ip); out_alloc: gfs2_alloc_put(ip); return error; }
static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, unsigned int mode, const struct gfs2_inum_host *inum, const u64 *generation, dev_t dev, struct buffer_head **bhp) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); unsigned int uid, gid; int error; munge_mode_uid_gid(dip, &mode, &uid, &gid); if (!gfs2_alloc_get(dip)) return -ENOMEM; error = gfs2_quota_lock(dip, uid, gid); if (error) goto out; error = gfs2_quota_check(dip, uid, gid); if (error) goto out_quota; error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); if (error) goto out_quota; init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp); gfs2_quota_change(dip, +1, uid, gid); gfs2_trans_end(sdp); out_quota: gfs2_quota_unlock(dip); out: gfs2_alloc_put(dip); return error; }
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); struct gfs2_alloc *al; int alloc_required; struct buffer_head *dibh; int error; al = gfs2_alloc_get(dip); if (!al) return -ENOMEM; error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto fail; error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); if (alloc_required < 0) goto fail_quota_locks; if (alloc_required) { error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); if (error) goto fail_quota_locks; al->al_requested = sdp->sd_max_dirres; error = gfs2_inplace_reserve(dip); if (error) goto fail_quota_locks; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + al->al_rgd->rd_length + 2 * RES_DINODE + RES_STATFS + RES_QUOTA, 0); if (error) goto fail_ipreserv; } else { error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); if (error) goto fail_quota_locks; } error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); if (error) goto fail_end_trans; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto fail_end_trans; ip->i_inode.i_nlink = 1; gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); return 0; fail_end_trans: gfs2_trans_end(sdp); fail_ipreserv: if (dip->i_alloc->al_rgd) gfs2_inplace_release(dip); fail_quota_locks: gfs2_quota_unlock(dip); fail: gfs2_alloc_put(dip); return error; }
static int gfs2_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to) { struct gfs2_inode *ip = GFS2_I(page->mapping->host); struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host); unsigned int data_blocks, ind_blocks, rblocks; int alloc_required; int error = 0; loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + from; loff_t end = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to; struct gfs2_alloc *al; unsigned int write_len = to - from; gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME|LM_FLAG_TRY_1CB, &ip->i_gh); error = gfs2_glock_nq_atime(&ip->i_gh); if (unlikely(error)) { if (error == GLR_TRYFAILED) { unlock_page(page); error = AOP_TRUNCATED_PAGE; yield(); } goto out_uninit; } gfs2_write_calc_reserv(ip, write_len, &data_blocks, &ind_blocks); error = gfs2_write_alloc_required(ip, pos, write_len, &alloc_required); if (error) goto out_unlock; ip->i_alloc.al_requested = 0; if (alloc_required) { al = gfs2_alloc_get(ip); error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto out_alloc_put; error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); if (error) goto out_qunlock; al->al_requested = data_blocks + ind_blocks; error = gfs2_inplace_reserve(ip); if (error) goto out_qunlock; } rblocks = RES_DINODE + ind_blocks; if (gfs2_is_jdata(ip)) rblocks += data_blocks ? data_blocks : 1; if (ind_blocks || data_blocks) rblocks += RES_STATFS + RES_QUOTA; error = gfs2_trans_begin(sdp, rblocks, 0); if (error) goto out; if (gfs2_is_stuffed(ip)) { if (end > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { error = gfs2_unstuff_dinode(ip, page); if (error == 0) goto prepare_write; } else if (!PageUptodate(page)) error = stuffed_readpage(ip, page); goto out; } prepare_write: error = block_prepare_write(page, from, to, gfs2_get_block); out: if (error) { gfs2_trans_end(sdp); if (alloc_required) { gfs2_inplace_release(ip); out_qunlock: gfs2_quota_unlock(ip); out_alloc_put: gfs2_alloc_put(ip); } out_unlock: gfs2_glock_dq_m(1, &ip->i_gh); out_uninit: gfs2_holder_uninit(&ip->i_gh); } return error; }
static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, struct gfs2_inode *ip) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); int alloc_required; struct buffer_head *dibh; int error; error = gfs2_rindex_update(sdp); if (error) return error; error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto fail; error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); if (alloc_required < 0) goto fail_quota_locks; if (alloc_required) { error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); if (error) goto fail_quota_locks; error = gfs2_inplace_reserve(dip, sdp->sd_max_dirres, 0); if (error) goto fail_quota_locks; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + dip->i_rgd->rd_length + 2 * RES_DINODE + RES_STATFS + RES_QUOTA, 0); if (error) goto fail_ipreserv; } else { error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); if (error) goto fail_quota_locks; } error = gfs2_dir_add(&dip->i_inode, name, ip); if (error) goto fail_end_trans; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto fail_end_trans; set_nlink(&ip->i_inode, S_ISDIR(ip->i_inode.i_mode) ? 2 : 1); gfs2_trans_add_meta(ip->i_gl, dibh); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); return 0; fail_end_trans: gfs2_trans_end(sdp); fail_ipreserv: if (alloc_required) gfs2_inplace_release(dip); fail_quota_locks: gfs2_quota_unlock(dip); fail: return error; }
static int gfs2_write_begin(struct file *file, struct address_space *mapping, loff_t pos, unsigned len, unsigned flags, struct page **pagep, void **fsdata) { struct gfs2_inode *ip = GFS2_I(mapping->host); struct gfs2_sbd *sdp = GFS2_SB(mapping->host); unsigned int data_blocks, ind_blocks, rblocks; int alloc_required; int error = 0; struct gfs2_alloc *al; pgoff_t index = pos >> PAGE_CACHE_SHIFT; unsigned from = pos & (PAGE_CACHE_SIZE - 1); unsigned to = from + len; struct page *page; gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_ATIME, &ip->i_gh); error = gfs2_glock_nq_atime(&ip->i_gh); if (unlikely(error)) goto out_uninit; error = -ENOMEM; page = grab_cache_page_write_begin(mapping, index, flags); *pagep = page; if (!page) goto out_unlock; gfs2_write_calc_reserv(ip, len, &data_blocks, &ind_blocks); error = gfs2_write_alloc_required(ip, pos, len, &alloc_required); if (error) goto out_putpage; ip->i_alloc.al_requested = 0; if (alloc_required) { al = gfs2_alloc_get(ip); error = gfs2_quota_lock(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto out_alloc_put; error = gfs2_quota_check(ip, ip->i_inode.i_uid, ip->i_inode.i_gid); if (error) goto out_qunlock; al->al_requested = data_blocks + ind_blocks; error = gfs2_inplace_reserve(ip); if (error) goto out_qunlock; } rblocks = RES_DINODE + ind_blocks; if (gfs2_is_jdata(ip)) rblocks += data_blocks ? data_blocks : 1; if (ind_blocks || data_blocks) rblocks += RES_STATFS + RES_QUOTA; error = gfs2_trans_begin(sdp, rblocks, 0); if (error) goto out; if (gfs2_is_stuffed(ip)) { if (pos + len > sdp->sd_sb.sb_bsize - sizeof(struct gfs2_dinode)) { error = gfs2_unstuff_dinode(ip, page); if (error == 0) goto prepare_write; } else if (!PageUptodate(page)) error = stuffed_readpage(ip, page); goto out; } prepare_write: error = block_prepare_write(page, from, to, gfs2_get_block); out: if (error) { gfs2_trans_end(sdp); if (alloc_required) { gfs2_inplace_release(ip); out_qunlock: gfs2_quota_unlock(ip); out_alloc_put: gfs2_alloc_put(ip); } out_putpage: page_cache_release(page); if (pos + len > ip->i_inode.i_size) vmtruncate(&ip->i_inode, ip->i_inode.i_size); out_unlock: gfs2_glock_dq_m(1, &ip->i_gh); out_uninit: gfs2_holder_uninit(&ip->i_gh); } return error; }
static int gfs2_rename(struct inode *odir, struct dentry *odentry, struct inode *ndir, struct dentry *ndentry) { struct gfs2_inode *odip = GFS2_I(odir); struct gfs2_inode *ndip = GFS2_I(ndir); struct gfs2_inode *ip = GFS2_I(odentry->d_inode); struct gfs2_inode *nip = NULL; struct gfs2_sbd *sdp = GFS2_SB(odir); struct gfs2_holder ghs[5], r_gh; struct gfs2_rgrpd *nrgd; unsigned int num_gh; int dir_rename = 0; int alloc_required; unsigned int x; int error; if (ndentry->d_inode) { nip = GFS2_I(ndentry->d_inode); if (ip == nip) return 0; } /* Make sure we aren't trying to move a dirctory into it's subdir */ if (S_ISDIR(ip->i_inode.i_mode) && odip != ndip) { dir_rename = 1; error = gfs2_glock_nq_init(sdp->sd_rename_gl, LM_ST_EXCLUSIVE, 0, &r_gh); if (error) goto out; error = gfs2_ok_to_move(ip, ndip); if (error) goto out_gunlock_r; } num_gh = 1; gfs2_holder_init(odip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); if (odip != ndip) { gfs2_holder_init(ndip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; } gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; if (nip) { gfs2_holder_init(nip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh); num_gh++; /* grab the resource lock for unlink flag twiddling * this is the case of the target file already existing * so we unlink before doing the rename */ nrgd = gfs2_blk2rgrpd(sdp, nip->i_no_addr); if (nrgd) gfs2_holder_init(nrgd->rd_gl, LM_ST_EXCLUSIVE, 0, ghs + num_gh++); } error = gfs2_glock_nq_m(num_gh, ghs); if (error) goto out_uninit; /* Check out the old directory */ error = gfs2_unlink_ok(odip, &odentry->d_name, ip); if (error) goto out_gunlock; /* Check out the new directory */ if (nip) { error = gfs2_unlink_ok(ndip, &ndentry->d_name, nip); if (error) goto out_gunlock; if (S_ISDIR(nip->i_inode.i_mode)) { if (nip->i_di.di_entries < 2) { if (gfs2_consist_inode(nip)) gfs2_dinode_print(nip); error = -EIO; goto out_gunlock; } if (nip->i_di.di_entries > 2) { error = -ENOTEMPTY; goto out_gunlock; } } } else { error = permission(ndir, MAY_WRITE | MAY_EXEC, NULL); if (error) goto out_gunlock; error = gfs2_dir_check(ndir, &ndentry->d_name, NULL); switch (error) { case -ENOENT: error = 0; break; case 0: error = -EEXIST; default: goto out_gunlock; }; if (odip != ndip) { if (!ndip->i_inode.i_nlink) { error = -EINVAL; goto out_gunlock; } if (ndip->i_di.di_entries == (u32)-1) { error = -EFBIG; goto out_gunlock; } if (S_ISDIR(ip->i_inode.i_mode) && ndip->i_inode.i_nlink == (u32)-1) { error = -EMLINK; goto out_gunlock; } } } /* Check out the dir to be renamed */ if (dir_rename) { error = permission(odentry->d_inode, MAY_WRITE, NULL); if (error) goto out_gunlock; } alloc_required = error = gfs2_diradd_alloc_required(ndir, &ndentry->d_name); if (error < 0) goto out_gunlock; error = 0; if (alloc_required) { struct gfs2_alloc *al = gfs2_alloc_get(ndip); error = gfs2_quota_lock(ndip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto out_alloc; error = gfs2_quota_check(ndip, ndip->i_inode.i_uid, ndip->i_inode.i_gid); if (error) goto out_gunlock_q; al->al_requested = sdp->sd_max_dirres; error = gfs2_inplace_reserve(ndip); if (error) goto out_gunlock_q; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + al->al_rgd->rd_length + 4 * RES_DINODE + 4 * RES_LEAF + RES_STATFS + RES_QUOTA + 4, 0); if (error) goto out_ipreserv; } else { error = gfs2_trans_begin(sdp, 4 * RES_DINODE + 5 * RES_LEAF + 4, 0); if (error) goto out_gunlock; } /* Remove the target file, if it exists */ if (nip) { if (S_ISDIR(nip->i_inode.i_mode)) error = gfs2_rmdiri(ndip, &ndentry->d_name, nip); else { error = gfs2_dir_del(ndip, &ndentry->d_name); if (error) goto out_end_trans; error = gfs2_change_nlink(nip, -1); } if (error) goto out_end_trans; } if (dir_rename) { struct qstr name; gfs2_str2qstr(&name, ".."); error = gfs2_change_nlink(ndip, +1); if (error) goto out_end_trans; error = gfs2_change_nlink(odip, -1); if (error) goto out_end_trans; error = gfs2_dir_mvino(ip, &name, ndip, DT_DIR); if (error) goto out_end_trans; } else { struct buffer_head *dibh; error = gfs2_meta_inode_buffer(ip, &dibh); if (error) goto out_end_trans; ip->i_inode.i_ctime = CURRENT_TIME; gfs2_trans_add_bh(ip->i_gl, dibh, 1); gfs2_dinode_out(ip, dibh->b_data); brelse(dibh); } error = gfs2_dir_del(odip, &odentry->d_name); if (error) goto out_end_trans; error = gfs2_dir_add(ndir, &ndentry->d_name, ip, IF2DT(ip->i_inode.i_mode)); if (error) goto out_end_trans; out_end_trans: gfs2_trans_end(sdp); out_ipreserv: if (alloc_required) gfs2_inplace_release(ndip); out_gunlock_q: if (alloc_required) gfs2_quota_unlock(ndip); out_alloc: if (alloc_required) gfs2_alloc_put(ndip); out_gunlock: gfs2_glock_dq_m(num_gh, ghs); out_uninit: for (x = 0; x < num_gh; x++) gfs2_holder_uninit(ghs + x); out_gunlock_r: if (dir_rename) gfs2_glock_dq_uninit(&r_gh); out: return error; }
static int gfs2_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) { struct gfs2_inode *dip = GFS2_I(dir); struct gfs2_sbd *sdp = GFS2_SB(dir); struct inode *inode = old_dentry->d_inode; struct gfs2_inode *ip = GFS2_I(inode); struct gfs2_holder ghs[2]; int alloc_required; int error; if (S_ISDIR(inode->i_mode)) return -EPERM; gfs2_holder_init(dip->i_gl, LM_ST_EXCLUSIVE, 0, ghs); gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, ghs + 1); error = gfs2_glock_nq_m(2, ghs); if (error) goto out; error = permission(dir, MAY_WRITE | MAY_EXEC, NULL); if (error) goto out_gunlock; error = gfs2_dir_check(dir, &dentry->d_name, NULL); switch (error) { case -ENOENT: break; case 0: error = -EEXIST; default: goto out_gunlock; } error = -EINVAL; if (!dip->i_inode.i_nlink) goto out_gunlock; error = -EFBIG; if (dip->i_di.di_entries == (u32)-1) goto out_gunlock; error = -EPERM; if (IS_IMMUTABLE(inode) || IS_APPEND(inode)) goto out_gunlock; error = -EINVAL; if (!ip->i_inode.i_nlink) goto out_gunlock; error = -EMLINK; if (ip->i_inode.i_nlink == (u32)-1) goto out_gunlock; alloc_required = error = gfs2_diradd_alloc_required(dir, &dentry->d_name); if (error < 0) goto out_gunlock; error = 0; if (alloc_required) { struct gfs2_alloc *al = gfs2_alloc_get(dip); error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); if (error) goto out_alloc; error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); if (error) goto out_gunlock_q; al->al_requested = sdp->sd_max_dirres; error = gfs2_inplace_reserve(dip); if (error) goto out_gunlock_q; error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + al->al_rgd->rd_length + 2 * RES_DINODE + RES_STATFS + RES_QUOTA, 0); if (error) goto out_ipres; } else { error = gfs2_trans_begin(sdp, 2 * RES_DINODE + RES_LEAF, 0); if (error) goto out_ipres; } error = gfs2_dir_add(dir, &dentry->d_name, ip, IF2DT(inode->i_mode)); if (error) goto out_end_trans; error = gfs2_change_nlink(ip, +1); out_end_trans: gfs2_trans_end(sdp); out_ipres: if (alloc_required) gfs2_inplace_release(dip); out_gunlock_q: if (alloc_required) gfs2_quota_unlock(dip); out_alloc: if (alloc_required) gfs2_alloc_put(dip); out_gunlock: gfs2_glock_dq_m(2, ghs); out: gfs2_holder_uninit(ghs); gfs2_holder_uninit(ghs + 1); if (!error) { atomic_inc(&inode->i_count); d_instantiate(dentry, inode); mark_inode_dirty(inode); } return error; }